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The considered directions of management of a technological level and quality
New production have through character from mikro - to macrolevel.
However at microlevel there is an internal control system
Technological level and quality of new production.
The big help application of a selective method here can render.
The selective method is useful, when certified tests are conducted and
Durability, reliability and other parametres of new production is estimated.
The selective method can be applied and to the stability control
Technological processes (based on new technologies).
At an estimation of new production it is necessary to consider interrelation:
The statistical theory applies two basic quality monitoring: the discrete
And continuous. At a discrete method check of products is carried out at
Reception of party and on an exit from manufacture. The continuous control assumes
Regular supervision over a course and results of process of manufacture.
The manufacturer supervises quality of new technics at all stages
Manufactures. Quality of the new technics got by the consumer,
It is estimated through quality of production made on it.
"Small sample" is useful to the decision of both problems so-called.
The essence of a method consists that of all set (general - N)
The small number of units n (a sample no more than 20) is selected. For
Each sample are calculated selective average () or a share (W) and selective
, (m - number of defects, refusals, etc.);
The size n-1 is called as number of degrees of freedom (r) for a dispersion. It -
Number of variants which can have any values, without changing
Sizes of average.
In small sample the general totality dispersion is unknown, therefore
For its estimation the dispersion of small sample (2) is used. For an estimation
Parametres of a general totality by results of small it
Distribution of Stjudenta (t - criterion) is used.
For each value n in tables of distribution of Stjudenta is available t -
Function and the distribution.
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